3ML4 image
Deposition Date 2010-04-16
Release Date 2010-07-14
Last Version Date 2024-11-20
Entry Detail
PDB ID:
3ML4
Title:
Crystal structure of a complex between Dok7 PH-PTB and the MuSK juxtamembrane region
Biological Source:
Source Organism:
Mus musculus (Taxon ID: 10090)
Host Organism:
Method Details:
Experimental Method:
Resolution:
2.60 Å
R-Value Free:
0.30
R-Value Work:
0.25
R-Value Observed:
0.25
Space Group:
P 32 2 1
Macromolecular Entities
Polymer Type:polypeptide(L)
Molecule:Protein Dok-7
Gene (Uniprot):Dok7
Chain IDs:A, B, C, D
Chain Length:224
Number of Molecules:4
Biological Source:Mus musculus
Polymer Type:polypeptide(L)
Molecule:Muscle, skeletal receptor tyrosine-protein kinase
Gene (Uniprot):Musk
Chain IDs:E, F, G, H
Chain Length:13
Number of Molecules:4
Biological Source:Mus musculus
Modified Residue
Compound ID Chain ID Parent Comp ID Details 2D Image
MSE A MET SELENOMETHIONINE
PTR E TYR O-PHOSPHOTYROSINE
Primary Citation
The Cytoplasmic Adaptor Protein Dok7 Activates the Receptor Tyrosine Kinase MuSK via Dimerization.
Mol.Cell 39 100 109 (2010)
PMID: 20603078 DOI: 10.1016/j.molcel.2010.06.007

Abstact

Formation of the vertebrate neuromuscular junction requires, among others proteins, Agrin, a neuronally derived ligand, and the following muscle proteins: LRP4, the receptor for Agrin; MuSK, a receptor tyrosine kinase (RTK); and Dok7 (or Dok-7), a cytoplasmic adaptor protein. Dok7 comprises a pleckstrin-homology (PH) domain, a phosphotyrosine-binding (PTB) domain, and C-terminal sites of tyrosine phosphorylation. Unique among adaptor proteins recruited to RTKs, Dok7 is not only a substrate of MuSK, but also an activator of MuSK's kinase activity. Here, we present the crystal structure of the Dok7 PH-PTB domains in complex with a phosphopeptide representing the Dok7-binding site on MuSK. The structure and biochemical data reveal a dimeric arrangement of Dok7 PH-PTB that facilitates trans-autophosphorylation of the kinase activation loop. The structure provides the molecular basis for MuSK activation by Dok7 and for rationalizing several Dok7 loss-of-function mutations found in patients with congenital myasthenic syndromes.

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Primary Citation of related structures